[rizzom5000]

Society is already structured to handle a population where approximately 50% of adults cannot read beyond the 6th grade level. For all the hemming and hawing and throwing money at education, it might be the best we ever get. I'd venture that our society would continue to operate just fine if that number went up to 75% of the population, considering the pareto rule about the percentage of workers who are actually productive and so on.

https://www.apmresearchlab.org/10x-adult-literacy